Body mass, structural size, and life-history patterns of the Columbian ground squirrel
Article Abstract:
The elevational cline in life-history traits and in body mass exhibited by Columbian ground squirrels (Spermophilus columbianus) was investigated. In particular, the extent to which structural size and physiological condition determine the observed elevational cline in life history traits was studied. The results showed that life history traits and physiological condition were correlated and were phenotypically plastic. In contrast, adult squirrel structural size did not exhibit phenotypic plasticity and did not vary over the elevation gradient.
Publication Name: The American Naturalist
Subject: Earth sciences
ISSN: 0003-0147
Year: 1992
User Contributions:
Comment about this article or add new information about this topic:
Nonequilibrium population structure in forked fungus beetles: Extinction, colonization, and the genetic variance among populations
Article Abstract:
Forked fungus beetle (Bolitotherus cornutus) populations were studied to determine the effects of extinction and recolonization on genetic variance among populations. Based on an analysis of population size distribution, migration rate, extinction rate and colonization number, it was predicted that genetic variance is increased with local extinction and recolonization. The prediction was corroborated by the results of electrophoretic comparison of beetle populations of different ages.
Publication Name: The American Naturalist
Subject: Earth sciences
ISSN: 0003-0147
Year: 1992
User Contributions:
Comment about this article or add new information about this topic:
Speciation: founder events and their effects on x-linked and autosomal genes
Article Abstract:
The hypothesis of speciation by drift-mediated peak shifts needs special assumptions taking into account the genetic conditions depending on the nature of genetic variation for reproductive isolation. A study analyzes the effect of random genetic drift and founder events in determining speciation showing that the speciation by founder events can occur to a greater extent with x-linked loci than equivalent autosomal genes. This accounts for the Haldane's rule.
Publication Name: The American Naturalist
Subject: Earth sciences
ISSN: 0003-0147
Year: 1995
User Contributions:
Comment about this article or add new information about this topic:
- Abstracts: Structure and tectonic development of the southern Rocky Mountain trench. Comment on 'Mid-Cretaceous thrusting in the southern coast Belt, British Columbia and Washington, after strike-slip fault reconstruction' by Paul J. Umhoefer and Robert B. Miller
- Abstracts: Crustal collapse, mantle upwelling, and Cenozoic extension in the North American Cordillera. Numerical modeling of Cenozoic stress patterns in the mid-Norwegian margin and the northern North Sea
- Abstracts: Do cephalopods and larvae of other taxa grow asymptotically. To grow or not to grow: optimal resource allocation for Daphnia
- Abstracts: Wolf pack size and food acquisition. Nest predation among vegetation layers and habitat types: revising the dogmas
- Abstracts: Theoretical implications for the evolution of postsegregational killing by bacterial plasmids. On the evolution of masting behavior in trees: predation or weather?